gistfile1.m

- (AVCaptureSession*)captureSession
{
    if(!_captureSession) {
        _captureSession = [[AVCaptureSession alloc] init];
        _captureSession.sessionPreset = AVCaptureSessionPresetMedium;
        
        AVCaptureDeviceInput* videoInput = [AVCaptureDeviceInput deviceInputWithDevice:[AVCaptureDevice frontFacingCameraIfAvailable] error:nil];
        
        AVCaptureDeviceInput * audioInput = [AVCaptureDeviceInput deviceInputWithDevice:[AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio] error:nil];
        
        [self.captureSession beginConfiguration];
        
        [_captureSession addInput:videoInput];
        [_captureSession addInput:audioInput];
        [self.captureSession addOutput:self.fileOutput];
        [self.videoConnection setVideoOrientation:[[UIDevice currentDevice] orientation]];
        
        [self.captureSession commitConfiguration];
    }
    return _captureSession;
}


- (AVCaptureVideoPreviewLayer*)captureVideoPreviewLayer
{
    if (!_captureVideoPreviewLayer) {
        _captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.captureSession];
        _captureVideoPreviewLayer.frame = self.videoPlaceholderView.bounds;
        _captureVideoPreviewLayer.orientation = [[UIDevice currentDevice] orientation];
        _captureVideoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
    }
    return _captureVideoPreviewLayer;
}